I am thinking of buying membership at Kew Gardens either for myself or for my partner. Originally I was thinking of buying joint membership, but as individual membership also admits a family member as a guest there probably isn't much point. Their website offers a clear definition of a family member as a "spouse, civil partner, partner who you live with, sibling, lineal descendant or ancestor". I am just wondering whether anyone on here is a member and has experience of bringing guests. Do they ever ask for proof that somebody is a family member, or do they really just make this specification to satisfy HMRC, and then simply take on trust/common sense that guests are actually family members? Obviously very few people will turn up with their marriage/civil partnership certificate, or proof that they live at the same address (e.g. electoral register, bank statements, utility bills, etc), birth certificate, etc. In fact, I have no means of proving that my own father is actually my "ancestor".