Retirement tax questions

@macuser_22  Once custodial Roth IRA is set up at the brokerage firm for the child, you can set up a bank account to link to it.  That way, you can transfer money into it.  For example, let’s say the child earns $6000 a year.  To transfer $6000 into the custodial Roth IRA, do you set up the parents bank account to transfer the funds or do you set up the child’s bank account to transfer the funds. People said it doesn’t really matter.