I don't want to put a lot of effort into finding my estranged step-sister and her kids to execute my mom's will. She will lose just under a million dollars if I don't, but that's not my problem.
That seems very insensitive. What do you hope to achieve by acting like that?
I don't want to give that bitch or her kids any money.
If it's in the will that she gets the money you can't just ignore it. It's her money whether you want her to get it or not.
Yeah, Maybe I'll have the lawyer try to find her, but I'm not going to do it.
That seems like a fair compromise. You don't have to waste your time looking and your step-sister will still get what is rightfully hers. Your Mom would be happy with you knowing that you are helping to carry out her wishes.