Hi Melby,
Great to hear you are seeing the lawyer today. Your ex p is a prize bully and also rather stupid. In my experience one catches more flies with honey than with a big stick iykwim?
Try and see his behaviour for what is. I know it is hard. Don't give him more power by letting him stress you out more than usual. The best you can do is continue to stay strong, keep doing what you have been doing for your little ones. You are doing a great job.
Let's face it - Hoobley has hit the nail on the head - he does not have real concerns. He is trying to destabilise you at the moment.
If he honestly had serious concerns about your ability to care for the kids he would have made moves to have them removed from you and successfully done so a long time ago. He hasn't done so. So he is just trying to bully and manipulate you to a certain position.
Papillion is right - keep records of these conversations. Keep the texts. They may come in handy.
Good luck.
Belinda