Going My Way

[snopes]

Comment: I have heard, as well as has others, that in the movie "Going My
Way" that Bing Crosby surprised co-star Barry Fitzgerald with his real
mother in the movie's final scene, instead of the actress who had been
rehearsing the part of the old priest's mother. I cannot seem to find
corroboration of this account anywhere. Fitzgerald's reaction seems to be
one of total shock. Did Crosby, during war time travel restrictions,
actually pull this off?

[pob14]

According to IMDB, the mother was played by Adeline DeWalt Reynolds. IIRC, she certainly looked like she could have been his mother, and it's a very moving scene.