Yea, country matters.

Having personal CSEM if you got it when you were within the age range in Canada and it is consentual, it is legal. Even if you are now 30 and got it when you were 12. Still legal. But that consent can be revoked, at which time it is no longer legal.

This also in nulled if you share/ show ANYONE.

Him allowing her to see his photos... This is now illegal.

This all depends on the country you are in.

This would be legal in Canada as long as there is consent and the images are not shared or shown to anyone else.

This would fall under the personal use section.

This consent however can be revoked at ANY time, at which point you'd then be in possession of Child Sexual Exploitation Material (CSEM)

COUNTRY MATTERS (your mileage my vary)