Junk food all day

Okay all. I need some opinions on how to approach this or IF to approach this at all. My husbands best friends wife has become a very dear friend of mine. They have twin girls who are about to turn 4. The girls were born premature, weighing only about 2.5 lbs each at birth. But besides their low birth weights, they were actually very healthy. No lung issues, no feeding issues. They were like the perfect premie babies. That being said, I really disagree with the way their parents are raising them nutritionally and developmentally. I will say right now that I do not have children and I know that probably makes me the biggest rookie alive in the eyes of all mothers out there when it comes to children lol BUT. I’m a healthcare professional who has worked in the NICU and with children my entire career and I was extremely involved in raising my youngest brother so I’m not totally clueless here. My chief complaint is the way the girls eat. Their parents don’t feed them breakfast or lunch. They simply snack all day until dinner time and dinner typically consists of French fries and ketchup. All day long they have pringles, cheesits, m&ms;, skittles, goldfish, Gatorade and sprite. ALL. DAY. LONG. It legitimately upsets me because their mom is a pediatric RN and simply should know better. They are ALWAYS sick and even though they were premature I think a lot of it has to do with their diet. Also....they don’t eat dinner until like 8-9pm. So they go all day on crap food only to eat deep fried carbs right before bed. My husband knows how I feel about it and although he agrees he always says “they aren’t our kids”. And I understand that, I just love them and worry about them. The second thing that frustrates me is their day to day routine. They never get read to, they never color or play with play dough or paint. All they do is watch YouTube videos on their iPads from sun up to sun down. And not educational videos (which would be slightly better) but random skateboarding or cat videos. They fall asleep with their iPads every night. Their parents don’t read to them at night. They fall asleep holding their iPads in their laps every single night. And you can tell the girls are affected by it. They hardly speak in full sentences, are so painfully shy when someone is actually talking to them and asking them questions. And their parents don’t encourage their speech either. They will only ask them yes or no questions so the girls are never required to actually converse. It really upsets me. Probably more than it should. Don’t get me wrong...they are loved. But they get whatever they want which to a 4 year old is technology and candy all day everyday if your parents allow it. I don’t want to say this is abuse but to me it is neglect. I would love some insight on how to handle this or if I should just turn a blind eye and let them do as they wish as parents.