I have a brother with a less than stellar past. He was given a new chance after "paying his debt for youthful indiscretions" but squandered it by stealing from both friends and family members, then calling and graphically threatening the sister who turned him in (using the jail phone...how dumb can you be?) which resulted in more charges, witness tampering. My parents also put in a home security system, as Criminal Brother's friends were showing up at their house looking for him/his stuff/their money. From what I understand that quit after a month or so of him being arrested and his name showing up in the Felony Filings portion of the newspaper.
Although I gave him a limited second chance (Facebook friended him, went to his wedding--which turned out to be fake--, visited him at the hospital), he will not be getting a third chance from me. I'm already hearing from family members (people he scammed and stole from!) that he's using his time in jail to "turn over a new leaf." I am not obliged to bring myself or my children around a criminal, even if we are related.
OP, you are not obliged to be around anyone you don't want to be around, particularly if that person is a user and thief. I don't know what "imaginary tether" you have to this person, but any line, even family relation, can be severed or ignored.