Here's a different look at things. My ex is Thai and we have 2 girls both born in Canada. When I retire to Siam will it be difficult for them to come live with me if they want? They will be 22 and 21 and I hope by then they will be off having their own lives. But what they choose to follow dear old dad to Thailand. God forbid.
TLDR : Answer Summary
The individual is considering the implications of retiring in Thailand and the possibility of his Canadian-born daughters moving there with him. Since their mother is Thai, the daughters are eligible for Thai citizenship and can apply for Thai passports. The process may require some documentation, such as their birth certificates and, potentially, their mother's Thai ID. Although they are over the age limit for sponsoring a parent for a long-term visa, they can independently apply for their citizenship and passports.