It is entirely “Christian” to extend God’s teaching and grace to these children, even while simultaneously recognizing that the “two daddies” are living a sinful lifestyle. Christ came to save the lost.
If the children reared by homosexuals begin wrestling between the values they learned at school as those taught at home, that’s good.
We’ve had a lesbian couple attend our church years back . Instead of booting them out, our Pastor said they were welcome to attend, but not to become members while they were in this relationship. After regular church attendance and clear Biblical teaching, one woman repented and has left the lifestyle, choosing a life of abstinence rather than to continue in her rebellion against God. The other woman never attended again.
God could well use the ignorance of these homosexuals to save the children.