She wants what is best for Ben."

The insider went on, “What matters most to her is Ben being a great dad.

It’s safe to says she deserves the mom (and ex-wife) of the year award.

Jennifer Garner smiling

Luckiest parents in the world.

Thanks for all the good you do,” adding, “Happy Mother’s Day.

Love, their Dad.”

Ben Affleck and Jennifer Garner at event

It’s not the first time Affleck has expressed his thanks for Garner.

And I wish her the very best."