Hi nfellen and welcome to the forum.
Another way to make True a number is using a Unary (I think that is what it's called). The idea is you put a negative sign in front of stuff that is true so it turns to negative. You put two negative signes and it turns it positive. See if this formula works for you in the attached..
=SUMPRODUCT(--(K2:K25="F")*--(T2:T25="Parent"))
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