They are both in tertiary education. DD21 has loans & works & gets £250 mo (via my ltd company) from us, so indirectly. Rarely home.
DS lives at home, low fees at the moment, if he goes for a degree, then will get loans, etc like sister. STBXH makes much less than me & also "babies" DCs too much; e.g. Son ought to get a job, he won't push it. How liable am I given their age?