Okay, I just thought I'd talk about my ideas on how the Diamond would be as mum's. Sorry for any spelling or grammar mistakes.
First White. She is 100% a wine mum. Nobody can change my mind on that. She has an assortments of wines, a whole cellar dedicated to the stuff. Of course she wouldn't allow the child to drink any, she know better and the wine is her prized possesion. Okay maybe, just maybe, she'd allow the kid to take a sip while Blue and Yellow weren't looking. The kid would just end up spitting it out and try get the taste out of their mouth. This would draw the attention of Blue and Yellow and they'd most likely not be happy with White allowing the child to have a tiny sip of her wine. She'd just shrug it off. Apart from that, she'd just down right spoil the kid with load of expensive things and couldn't give a crap what they do. White would be so sassy and sarcastic but would make a great mum. Nothing is boring when your with her. Obviously she has an amazing sense of fashion and would try get the kid into wearing clothes like her. Blue and Yellow would come home to find the a mini White. They'd not be able to tell the difference between the two if it weren't for their difference in height. She wouldn't be happy when the other two Diamonds try to remove all the make-up from the childs face. That took time talent and hard work. Not to mention the make-up was expensive.
Yellow would always, and I mean always, be seen with a coffee in her hand. Just black coffee. It would be the only thing you see her drink. She just needs the caffeine to help power her through the kids incessant whining and nagging. She can't deal with kids and stares into space as they run around her reeking havoc. Honesty, she just couldn't care less. Even if the kid had set fire to a building shed stand their with the coffee, a blank expression on her face. In fact, she would probably end up praising the kid for doing such a thing. She might help the kid with it. Blue and White would not be impressed though, more so Blue. Would definitely laugh if the kid fell over. She wouldn't even try hold it back. But, she would definitely not stand for anyone bullying or being horrible to the child. If anyone made the kid cry they'd feel the full wrath of Yellow Diamond. She protects the kid no matter what and might teach them to fight, but just can't wait for White or Blue to take the kid off of her hands. However, the child does have a special place in her heart, though she'll not let anyone see that.
Blue would practically wrap the kid in bubble warp. She'd molly coddle them and stick by their side 24/7. No doubt she would have a full first aid kit in her hand bag and would overreact if the kid got a tiny scratch. Just wraps the entire limb in a badnge. She just can't say no to the kid and would buy them anything they want. That kid would be spoiled. She wouldn't hesitate to lecture the kid if they did something wrong. If, for some reason, the kid ended up crying because of her words then she'd end up crying too. To apologise she would take the kid to McDonald's, all while Yellow and White stand there unimpressed. This would mean it was down to White and Yellow to teach the kid the rights and wrongs of life. Blue just doesn't have the heart to make the child feel upset.
Overall, they would probably make great mums.