That will be alright, as long as you aren't going to be going and completing raids/dungeons/other content etc for him. Bungie don't give a really black and white - this is fine and this isn't list but instead give some more general guideline examples that summed up generally amount to "don't go doing content for them (free or paid) or grinding out weapons/armor rolls" [quote]Account Recoveries Account recoveries are when a player gives someone else access to their platform account and control of their Destiny characters. This not only puts your account security at risk, but it can also have adverse effects on other players’ experiences in competitive matchmade activities. Starting this Season, participating as a buyer or seller of account recovery services could result in a ban on your account. While we will only be placing bans or restrictions for certain circumstances, we strongly recommend that you never give your account login information to anyone else. Not recommended, but won’t get you banned: Sometimes I let my kid grind Lost Sectors. I asked my cousin’s friend to recover my account to check Xur because I was stuck at a wedding in a remote area with no internet access. My roommates and I all share an account on the common room’s console. I let my friend borrow my account to try out a weapon roll. What could get you banned or restricted: Charging others to recover their account for boosting, earning items, completing content, etc. Recovering accounts in exchange for anything of value including but not limited to Patreon supporters, subscribers, follows, gift cards, etc. Paying someone to recover your account to be boosted, have items earned, etc. Boosting recoveries done for free can also result in bans or restrictions.[/quote] https://help.bungie.net/hc/en-us/articles/360049517431-Destiny-Account-Restrictions-and-Banning-Policies