They were a mixed family - his, hers, and theirs. So some of the kids were older.
They had one son together. When he was about a year old, he began to just wander around the chapel - ever week. He'd wander, while they watched him from the back of the chapel, and then eventually they'd send one of their teen sons to bring him back.
Once he wandered up onto the stand and the Bishop grabbed him and held him on his lap until they came to get him. Another time he wandered up on the other side of the stand during the Sacrament. The piano was uncovered for a musical number later in the meeting, and he started banging on the keys. That got them to jump and run to the front as well.
It was just weird that they'd let him wander so far.