Hm...They might just take it as a side account. If the accounts have the same IP, I'd say it would decrease the chance of them thinking it's a hacker, because a hacker would usually have a different IP than the one the account is usually using (unless the hacker is in your house on your internet).
They could also take it as a family member playing and you giving some pets to them.
You could send a neomail that says something like:
"Hey [insert family member], would you mind holding some of my pets? I know you like them, and I can't hold them, so would you take them? I know you'll take good care of them.
Thanks!"