I always draw myself a chart of both branches & I come up with 7th cousins - their common ancestor is a 6 x g grandfather - I have been known to be wrong (quite often

)
Husband distant rel 7th cousins
father father 6th cousins
gfather gfather 5th cousins
g gfather g gfather 4th cousins
gg gf gg gf 3rd cousins
ggg gf ggg gf 2nd cousins
gggg gf gggg gf 1st cousins
ggggg gf ggggg gf brothers
common ancestor - gggggg gf
Trish