What issues will arise if my son, with dual Thai-American citizenship, exits and re-enters Thailand using only his American passport due to an expired Thai passport?

The user is concerned about the implications of traveling outside Thailand with their son, who holds dual Thai-American citizenship, and returning with only his valid American passport while his Thai passport is expired. Comments suggest that the son may face difficulties exiting Thailand since he originally entered on his Thai passport, and there's a risk he may need appropriate consent from his mother. Additionally, it's noted that children cannot be fined for overstays, and the best course of action would be to ensure his Thai passport is renewed before future travel.