What is the way out of coercion if I coerced someone into something, and is "حلل" (make lawful/forgive) sufficient? And if the coercer was my father, is it enough to say: "Forgive your children if they have coerced you into anything"?

The rights of parents are immense, and Allah has enjoined kindness to them after His own right. Therefore, they must be treated with gentleness and benevolence, and it is not permissible to coerce them. If a father has been wronged by coercion or by speaking to him in a way that harms him, one must seek his forgiveness, because harming him falls under the forbidden act of undutifulness (aqooq). The criterion for undutifulness is harming parents in any way whatsoever. If the wrong was in their honor, one must seek forgiveness from the wronged person; if they are unaware, there is no need to inform them, but rather one should seek forgiveness for them, supplicate for them, and praise them with good words in the gatherings where they were previously slandered.

And Allah knows best.