Michaels dated actress and singer Susie Hatton from 1988 to 1993. They two were engaged. Hatton appeared in the 1988 music video for Poison's "Fallen Angel". Michaels had two daughters with Kristi...
It is not wrong to marry your ex wife's sister, but not a wise move. This could separate the two sisters and be very awkward for their family. It is better if you move on from this situation.
If your brother-in-law's ex-wife is your sister, you cannot marry his ex-wife.If your brother-in-law is the brother of your wife, then as long as you are no longer married, you can marry his ex-wife.