For sure many priests would make great models for moral character but I can see how sometimes priestly obligations would interfere with child-rearing/guardianship so I understand why cases like this are pretty rare. A priest has to be 100% available all the time, and having a kid would make that very difficult. In the story I envisioned writing, the priest ends up taking care of his five year old great-niece because the parents, grandparents, and godparents are all dead or missing as a result of the war. The priest is in his 60s and the kid is a 5 to 6 year old girl. The story is kind of an emotional roller coaster due to large amounts of comedy and tragedy that afflict this pair. Add to the fact that the girl’s father was of Jewish ancestry, and so the priest has the additional burden of protecting her since it’s Italy in 1943 and she’s very likely to end up being gassed in a concentration camp if not for some very creative interventions that he puts into place to protect her and a couple of other kids. The tragedy of the setting and some of the plot events combined with an older man with no child-rearing experience suddenly being stuck with a five year old would make for an interesting emotional experience for the readers.