I incest you tell us why though

What the absolute **** is wrong with your family? Specifically your mom.

Is this not the first relative she's married? Just taking notice of your username.

I used to work with a lady who was on marriage #6. Anyways, marriage #4 she married her daughters ex husband. So her former sun in law.

So, this is just a really awkward family gathering.

You should be more supportive of your mother. Humans have a long history of marrying cousins, and birth defects are not likely to arise from these unions unless several generations of cousins have reproduced. Besides that, if your mother is past the point of more kids there's really no issue at all.

On the plus side, there will be no hassles about bride’s side/groom’s side seating — it’ll be just one big mosh pit of similar DNA.

sometimes it's just better to keep it in the family.

that ain't right

Game of Throne :)