Quote:
1484... Meriadoc was the old (102) but still hale. He took counsel with his friend the Thain, and soon after they handed over their goods and offices to their sons and rode away over the Sarn Ford, and they were not seen again in the Shire.
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~ LoTR Appendix B; The Tale of Years (Later Events Concerning the Fellowship).
Note the plural here:
their sons. Firstly the Family trees only give Pippin one son, but in any case he can't hand over his office to more than one of his sons. So this passage suggests that Merry did indeed have at least one son.