KSD,
Please utilize this amended agreement (attached), and make the necessary changes/corrections to the names, bank accounts etc...etc.
Once is done...kindly send it to Khun Yuki and inform him to proceed.
Please also check with Khun Aea... perhaps she could sign 'for and onbehalf'...and also identify exactly which account should the payment be made to...so that it could be monitored...and cover for the mortgage