is it normal/acceptable for my son to find my wife attractive?

i married last year and my son is 12 and had 3 experiences which blatantly show his physical affection for my wife.

she is only aware of one of these experiences, and i have not told her of the other 2 in case it scares her (i may be wrong, it may not but anyway).

is this a problem or should i not worry?

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