My mother, brother, 1st cousin and I are on my 3rd cousin's family finder match list but she only appears as a match on my mother's and 1st cousin's list of matches.
When I run "in common" with my third cousin on my mother's or 1st cousin's, my brother and I appear.
How can we match someone but they don't match us?
Also, my mother shares 1126 matches with me but I only share 1123 matches with her.
When I run "in common" with my third cousin on my mother's or 1st cousin's, my brother and I appear.
How can we match someone but they don't match us?

Also, my mother shares 1126 matches with me but I only share 1123 matches with her.
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