Appropriate discipline for a generally well-behaved 18 year old?

Don't spank someone else's kids. If it is the parent you tell them they are in charge of discipline, if it is the sister of the kids just say you don't want to take part of it. You can't get into trouble for letting her take your belt but if you spanked them and the parents found out then you can get charged with violence towards minors and you definitely do not want that on your record.

If she wants to spank her own brothers that is her business and that is between her and her parents, but don't take part in giving spankings to kids that aren't your kids.

Since neither of you are the kid;s parents, you would have done better to tell them that you would take them home and tell their mom how they behaved. Just because the parents will spank them, does not mean it is appropriate for their sister or you to do so.

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