My sister in law posts a lot of pics of her husband and their two kids. But they are a great family, not fake or show offs. But we know that because we spend a lot of time with them. Sometimes things aren’t what they seem. Is it possible for you hang out with this family (just her, her partner and their child not a large crowd) so you can get to know them more on intimate level? Sometimes you might see things you wouldn’t see otherwise. It might not be what it seems and you might not have to worry about them, they might be fine .