While I'm not having a wedding party, FI plans to get engraved knives for both of our fathers and both of our brothers. So I would get gifts for my two SIL and both of our mothers. Would it be bad to give a gift certificate to a spa for my SILs? I would get something else for the mothers...something more like jewelry or something that suits each of them, but I've always been more interested in giving "experiences" more than gifts, so thought the spa would be good for SILs.