The RNLI says the man and boy were were swept out to sea off Aberffraw, on the west coast of Anglesey.
The man was able to make his way back to shore, but the child is still missing.
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This morning will begin cloudy, wet and rather breezy.
Most areas will become dry for a time this evening with clear spells.
It's one of the youngest world religions and this weekend celebrations have been held marking the anniversary of the birth of its founder.