Do both mother and son require 800k THB in their own accounts for retirement visas in Thailand?

I'm shutting this down. Both the 50+ year old child and the 50+ year old mother are on a one year extension of stay based on retirement. They both need to meet the financial requirements for the one year extension of stay based on retirement independently. These financial requirements are:

1. 800K THB in a Thai bank account seasoned for two months BEFORE applying for the one year extension of stay, and three months AFTER applying for the extension of stay, and the balance can never go below 400K THB throughout the year OR;

2. A monthly income overseas of 65K THB a month OR;

3. A letter from the embassy saying they make 65K THB a month (note: if the embassy issues the letter, they can not use the monthly income method).

There are no ways to "save" money, sorry.

To add on: Can OP come as mother's dependent, and mother on retirement visa, so that only one 800K needed to apply for visa?

Both will need their own account in sole name with 800k in each.

To confirm, both the mother, and the son, are over 50 years old? AND, they are both on a one year extension of stay based on retirement?