In August 2016, a gestational surrogate gave birth to triplets, on behalf of a gay couple in South Africa.
Some news reports indicated that the children shared genetics with both parents, and that's not exactly right.
In this case, each man's sperm was used to inseminate one ovum, and those ova were transferred into the body of the surrogate. One conception resulted in twins, hence the three children.
So, one pregnancy resulted in children having a genetic relation to one of their fathers, not both. This kind of outcome is not exactly novel because same-sex couples can have this kind of relationship to their children, but usually through serial pregnancies, not the same one.
Either so, the fathers are apparently happy with the outcome.