WTBH,
Stick to your guns, also, I don't know if you have a Harbor Freight Tools in your area, but they have inexpensive security products, door jamb alarms, door handle jiggle alarms, they even have night vision security cameras for 40.00
Also, if you cannot get security equipment then I would screw or nail that door shut.
If that is not a possibility then stack up empty soda cans inside that door, at least that will buy you some time to get the kids together and get out the front door. Use your imagination or better yet watch the movie Home Alone for some ideas.
Stay safe, you and the kids are in my prayers.
Bill