why does my husbands family think he should be responsible for his sister

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my husband was adopted at a young age alongwith his 2 sisters. his biological mother later had 2 more girl. he use to see his 2 youngest sisters once it a while. but once one of them got a drugs and keep starting truble he stopped having anything to do with her because when he and adopted family tried to help her she always got it to trouble even more. easter one of his sisters that was also adopted took the girl in along with her 3 kids. they wanted us to help by giving her money although she gets child support from 3 different men and food stamps. she uses the childsupport to by crack all the time . so my husband said no. so his enter family got mad at him. he to ld his other sister to watch her and not to let her get her into trouble. 2 days later the girl beat her oldest son and the sister through her out and keep the kids. the boy was then turned over to dss and given to the father. that same night she went out got high with two guys and wrecked the car. one guy died but her and her boyfriend were fine. they called my husband and told him she was going to die. they wanted him to come to the hospital. everyone was there. he told the to call with updates and if she got any worse hed come. she only needed stiches by the end of the night. again everyone was mad because he didnt do what they wanted and run to her. she had 3 different drugs in her body when brought in and come to fine out when she went to her sisters house she was running from a warrent. my husband keep tring to tell them she was on drugs and stuff. but noone would lesson. now she is out of the hospital and has refused treatment for the drugs. they again want us to support her with my husbands hard earned money when paying our own bills can get tight. they want us to take at least one of her kids and stuff like that. by the way 2 of the kids daddies are in prison.is he wrong or is it better to stay out of it because of the trouble that is going to follow? we have 4 kids of our own and dont need poeple that dont want to keep them selve straght aroud to currupt them.