How to not invite/explain why they aren't invited to a family gathering

Question

Asking on behalf of a friend....

I am having a family get together next month. I want to invite my adopted sister and her husband (whom I haven't spoken to in ages), but I don't want to invite her 2 children. Both of her kids are out of the house and in their late 20's, and they are both heavily into drugs, stealing, in and out of jail and therefore I do not want them to attend the gathering where small children will be and where they can scope out my house for 'goods'....

What is an easy way to not invite them, or to answer questions about why I do not want them there without hurting my sister's feelings? (My sister will take it to heart, and I don't want it to start a World War III)

(Serious responses only please, I just don't want to look like the bad person)

Thanks in advance!

Answer 1

If your sending out invitations be specific about who's names are included and say that the seating is limited.

Answer 2

think using your brain depending upon your family situation ok best of luck try to teach good behaviour to them best of luck