we have one account each and we have one wallet only and planning to join only one campaign after we reach Jr. Member as our rank,
frankly I don't believe about the story 3 of you and such... but why one wallet only ??
are you talking about one wallet as in using one bitcoin core or electrum wallet? or as in one bitcoin address?
either way, if it is true there are 3 of you... then you are asking for disaster to happen
do you guys also share one bank account? bitcoin wallet (or address) is just like a bank account.
you don't let other people get access to your bank account, do you?
so... use different separate bitcoin addresses (wallets)!! creating bitcoin addresses is super easy.
keep your own private keys. there is no reason for three of you to use one single bitcoin address