When is your wp renewal? You will get another 90days if you go before 23rd of March. Your son can make ED visa and your husband depending on him. That shouldn't be a problem.
Shania had one ed but the new school is incapable of filling the forms which is ridiculous. She is the only farang under 1300students. So this year no visa but Immigration Said next year she will need one again. The ed single entry is only 1900b.