5 yrs - Wood
A Family Tree Portrait in a wooden frame would make a lovely gift for this ocassion.

15 yrs - Crystal
Wine markers would look lovely with a set of crystal glasses for this anniversary.

25yrs - Silver
Personalised silver letter wine markers would look lovely with a bottle of wine or a set of glasses for this ocassion.

Any year!
A Family research voucher would be a lovely gift to start tracing the family history.