Yes, it is possible to apply for an in-country initial Non-O visa based on a parent of a Thai child, if your local immigration office allows in-country visa application. You also need to have the minimum remaining days with your entry stamp to apply for an initial visa.
Go to the local immigration office for their latest requirements for an in-country Non-O visa for that reason. Usually, the funds don't have to be seasoned for the initial visa application for Non-O based on a Thai child.
You don't need a re-entry permit to leave Thailand. But, you need to get a re-entry permit on your passport BEFORE you leave Thailand, to keep your current stamp "alive" and enter Thailand again on it.
You need to check with your local immigration office. Most offices let you apply for a 1-year extension based on marriage when you have 30 days or less remaining with your entry stamp on Non-O marriage. Some offices such as Bangkok, Chiang Mai, Phuket, and a few others accept your application for an extension when your stamp has less than 45 days.
Go to your local office in advance to get their latest requirements for a 1-year extension based on marriage to a Thai. Each office has its own list, including seasoning of funds.
, Your TM30 record is still valid. As your TM30 receipt has already been submitted, and you have proof of the same address (yellow book) that might be why they didn't ask you for a receipt.
Still, there could be a possibility of being asked for a receipt.
In that case, tell them you don't have a copy, no changes since registering. They just let it go or tell you to get one. If you are directed to get a receipt, go to the TM30 counter for that. As you bring your yellow book, it's not difficult to re-submit or get a receipt there.
-> There is no written limit. However, approval of your entry is always at the discretion of the officer at the passport control desk upon your entry.
If your family will visit you only on holidays, it will not be a problem.
Q. I think I was told by someone you can only visit twice a year on this entry stamp?
-> That is old and incomplete information. There used to be the rule of the limit of two visa-exempt entries by land per calendar year. It has been lifted months ago. There has never been a limit on entries by air.
Your 90-day report online may be rejected, as the online reporting window is now 15 days before until 7 days before the due date.
You have 7 days after the due date to report in person at the local immigration office. You can go tomorrow or a few days later.
Check the status of your report on the system before you go to the local office. Better to cancel if it's still pending when you go, to avoid any confusion.