Baby of the Bride (1991)

Soon after returning from their honeymoon, John and Margret Hix receive the surprise of their life - at 53, Margret is pregnant. Against her husband's wishes, Margret decides to keep the baby... but she isn't the only one in the family who is expecting. Margret's daughter, Mary, who has just left the convent, is due just a few months before her mother.