Thread by @Hasan22821492

First up on the summary of the 4th commandment is the first Dubium - on what is owed by a child toward their parents.

333. This commandment obligates us to love, respect and obedience to parents and all superiors in the matters in which they are subjected to them and during the time they are subjected to them. Particularly with parents, notable defect in this is a grave matter and mortal.

A son gravely sins against love if a. he shows hatred or bitterness to parents, b. if he always looks at and speak bitterly as if hating them, c. if he does not assist in grave spiritual or corporal necessity.
You sin gravely if you fail to offer prayer and sacrifice for parents.

Also if you are the heir and refuse to fulfill their last will and testament, or if you desire their death, you sin gravely. Also mortal if you don't seek to ensure they receive penance and other sacraments when they are at the point of death, or prevent them to make a will.

334. A son sins against reverence if he strikes parents even lightly or intends to do so, or if he would unnecessarily, and deliberately gravely sadden his parents when there is another way that is morally licit that does not cause this. This last one is also a sin against love.

If with insolence you provoke your parents to anger deliberately, or even with words that are not insolent but by which you know they will unnecessarily be offended.

For example, to a call a mother crazy, drunkard, bitch, witch or thief is always mortal, but silly, old or ignorant will only be mortal if the parent is known to likely gravely offended by it, or if the child uses these words to express hatred, or in a hateful way.

If one deliberately mocks and derides, curses at, abusively gestures at, etc toward their parents then it is mortally sinful for them. If it is not deliberate, it remains a sin, but is venial.

If you refuse to acknowledge your parents or hate them for their poverty and thereby pretend not to know them and not allow them to live under your roof without just cause (confer with your priest), you sin mortally.

Just cause here is defined as your suffering serious loss, or their having committed a major crime, then the sin becomes venial - it remains a sin because the outward pretense of your not knowing the parents remains a lie and is still sinful.

If you accuse (even if true) your parent of a true crime in public, this is mortal unless there is no other mode of correction (i.e. in some cases of treason, oath against the bishop or heresy), this is mortally sinful.

If one curses/swears at a parent, whether the parent is absent or present, alive or dead, they sin at least venially. If the curse is only vocal and not sincerely meant to irreverence or express an internal hatred of the parent, it is venial, but if sincere, it is mortal.

335. A son or daughter sins greatly against obedience if a. is disobedient in things with regard to the governance of the house (including chores), good morals, or the salvation of the soul,

b. if they take an unbecoming (according to custom of the region) spouse in defiance of the parent's will, c. if they refuse to marry according to a parent's will (especially if the parents will be emancipated from some grave hardship or if hatreds will be put to rest) -

Just causes would include (not exhaustive):
1. The suitor's family are of a sort that would be a detriment to future children
2. if the suitor is deformed, uncivil, foolish or sickly,
3. If after independence a son marries without parental consultation living away from parents

If one is disobedient to parents in things with regard to the governance of the house, good morals, or the salvation of the soul, and the parent is understood to have commanded sincerely explicitly or implicitly, one sins mortally usually.

However, if this is a parental command to perform an act regularly, and the disobedience takes place only occasionally due to negligence, one only sins venially. If one regularly fails to fulfill the command out of negligence of the Fourth Precept, one sins mortally.

Sons and daughters are not held to obey in those matters relevant to state, as this comes from divine call (vocation). Therefore a parent cannot compel a son or daughter against their will into clerical, married or religious life when they perceive a calling to the other.

This is of such importance that if a parent is known to be likely to unjustly impede one's pursuit to follow a divine calling to a particular state of life, one may conceal the matter (without lying) and fulfill the vocation.

Children are morally obligated to see to the feeding and other sustenance of needy parents, such that if they could be helped and are not, one sins gravely. Even if one enters religious life they are held to the fulfillment of this sustenance of their needy parents.