Cousins cM

[AInightingale]

I know this is highly variable, but just interested in people's experience of the figures they've received. What is the highest shared DNA in cM you've got/seen with a half first cousin or second cousin? The region is endogamous, though I can't find any other links to this person which might account for an accumulation of cM. I do know that two sisters married two brothers at some point in our fairly recent history so they will have passed down far larger shares of DNA from their grandparents, obviously. Is 735cM shared with someone who is a half first cousin feasible? I have nearly 400cM shared with a match who is looking definitely like a second cousin from the same family, which is very high in itself.

It's well within the range for half first cousin. This is a good chart for checking these:

Introducing the updated shared cM tool | DNA Painter Blog https://share.google/aWR89YCaGt95ENJRA

Thanks @newrubylane I hadn't seen that chart. Just puzzled as one site I accessed actually had the statement, 'if you share more than 700cM with a cousin, your parents were full siblings'!

"I have nearly 400cM shared with a match who is looking definitely like a second cousin from the same family, which is very high in itself."

My mum has three matches around 400cM (393 - 428) who are all half first cousins once removed.

In other words, they are the children of my mum's half first cousins (same grandfather but different grandmother). I'm not aware of any connection between the two grandmothers.

[EDIT]

Looking at the table above, that appears to be in range. The table says that for a half first cousin once removed the range is 62 - 469.

I share over 500cM with my mum's full first cousin on MH.