the answer is Their
How do you know
1. The boat belongs to the family.
2. There does not mean their.there is used as a location marker like “there it is” and their is used when talks nag about possessing something
Explanation:
the answer would be: it explains that at least one son must join the church
the expression ''as the tithe of his sons'' indicates how his father intended for at least one of his sons to serve the church. this phrase demonstrates that his father offered him as a last resort since none of his brothers chose to serve the church.
hope this answer you: )!