You need to upgrade to a full membership and sign the Honor Code, then you can add anyone who doesn’t already have a profile. If your boyfriend’s parents are living you might want to start with his grandparents - profiles of living people are always private, so unless he joins Wikitree and you add him to the trusted list for those profiles he won’t be able to see them anyway. Just make sure you have good sources (actual records) for anyone you add. Wikitree is one big tree, no “my tree” or “your tree.” You might want to do a little searching first and see if any of his relatives already have profiles here.