............If my 1st cousin has a baby that child is not my niece/nephew, they are my 2nd cousin. Because they are the second generational cousin to my FIRST cousin & vice versa.
I'm not gonna argue. Just pointing out the fact lol.
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If we go back up the chain MC, James & Molly live with there dad. Molly & Timmy love with there dad (you're Uncle). Its the Family Farm so we can assume it's been passed down meaning Molly & MC share a Great-Grandfather.
As Moly is you're 1st cousin then the child cannot be once-removed but instead she is you're 2nd cousin.