I salute mothers, especially mine. I also salute my wife's maternal work, which we actually launched together. My rule of thumb is that mothers start with a contribution of 9 months while fathers contribute 15-30 minutes in launching the next generation. It is true that financially fathers make large and important contributions but minute by minute, mothers count and they comfort.
I realize that mothers range in warmth and ability, but in general, we need them and we are grateful for them. Thanks, Moms!