If they were on FR I would gladly do so. since they're not (to the best of my knowledge) you can give them this reference. https://www.ewtn.com/expert/answers/abortio2.htm:
Exact wording from the CCL:
TITLE VI. DELICTS AGAINST HUMAN LIFE AND FREEDOM (Cann. 1397 - 1398) Can. 1397 A person who commits a homicide or who kidnaps, detains, mutilates, or gravely wounds a person by force or fraud is to be punished with the privations and prohibitions mentioned in ⇒ can. 1336 according to the gravity of the delict. Homicide against the persons mentioned in ⇒ can. 1370, however, is to be punished by the penalties established there. Can. 1398 A person who procures a completed abortion incurs a latae sententiae excommunication.
Your relatives are certainly free to ignore this, just as many people choose to ignore speed limits or laws about driving intoxicated. sooner or later it will catch up with them.
God always gets the final word and the last laugh.
On that point, at least, we fully agree:
Psa 2:2-5 The kings of the earth set themselves, and the rulers take counsel together, against the LORD, and against his anointed, saying, (3) Let us break their bands asunder, and cast away their cords from us. (4) He that sitteth in the heavens shall laugh: the Lord shall have them in derision. (5) Then shall he speak unto them in his wrath, and vex them in his sore displeasure.
Peace,
SR
And like a murder can be in heart, procuring can be indirectly by supporting abortion, and usually incurs treatment by Rome as a member in life and in death, with an ecclesiastical and maybe papal apostolic blessing, like for no less than Teddy K. Who is evidentially like the majority of RCs.
And as what one does and effects constitutes what one really believes, (Ja. 2:18; Mt./ 7:20) then this type of typical treatment testifies to what Rome really believes.