update and a few quick questions

Hey all My Mallards are doing well and getting big! I did get them a coop with a house. It's a total piece of junk! But after it sat in my yard for a few weeks I decided to just make do with it. (my mom actually ordered it and paid for it so I was trying to wait on her to decide if she was going to return it or whatever but I got sick of waiting lol) I put them in there at night and open it up late morning/early afternoon so they can swim and walk around the yard. I keep their food and water in there so they have to go in during the day to eat (besides what they find in the yard and pond) Today as I was bringing the food and water dishes in the house to wash them they were following me and one took off and flew over my head and the fence and landed in my front yard!! She looked spooked and immediately ran to the fence to be let back in the yard, little stinker! Anyway, I THINK I have 2 females and a male - my mom ordered the eggs, along with some chicken eggs, would they be related or no, or does it not matter? When will they lay eggs, and how will I know if they're fertile or not?