Disclaimer: The following is aimed at women looking for men, and men looking for women, respectively.
Tastes and opinions vary wildly of course, and there are many exceptions.
Even if it’s your child and you want to filter out everyone who would not want to date a single parent, an online dating profile is just not the right place to share pictures of kids.
If you’re a social person (or would like to appear as one), having a few group shots in your profile is generally a good idea.
Did you get their permission to put their face on a public dating profile?
We can’t tell, and in most cases, a photo like that can only harm our perception of you. Similarly to the above, we can’t really tell if that’s your child, nephew/niece, or a friend’s child, and specifying as much in your profile text just isn’t enough.
For ease of reading, all statements are generalized to apply to the majority and caveats are mostly left out.