Ludwig Thank you very much for clarifications. This is much clearer. Now I think I see where disconnect is.
Every family tree is oversimplifcation. The truth it, there is no way to display all the complexity of family ties on 2d layout that would look nice, would not contain huge gaps and would display 100% of the infromation at the same time. You should do simplifications in order to make this tree manageable.
There are programs that are designed to show all the relationships in all their complexities, but those trees are absolutely not sutable for printing, not even close. Tonfotos takes different approach. It does not try compete with all those genealogical programs, it is about photos mostly, and family tree function is made with pritning nice tree in mind as primary goal. That is why there is no way we can display all the possible life situations with all the exes and childred from different marriages, this is a limitation, but thanks to it trees look nice.
When we display central couple, we use all direct children from the cetnral person and all the children of the current spouse of central person. Then going up and down, we only follow direct blood connections where possible. That is the main approach.
So, it your bowtie situation, as I understand, the father is not displayed, since this father is not a spouse. As simple as that. If you want him on this chart, just make him spose temprorarily, and then remove. However, you also mentioned that children of the central person are not displayed, I am not sure why is that, I will need to check the code for that. But probably it is just because there is no spouse, which makes sense, and her parents become central people for the sake of the balance of the picture.
In the hourglass what you describe is completely correct behaviour. This person is not a spouse hence is not displayed. If you want to add him to your picture, just make him spouse temporarily. However agan, he will be part of the family then, and even not his children will be displayed as children of this family he is part of. I know this is not 100% perfect, but I don’t know any better way to display actual complexity of the situation with that woman, but make nice looking chart at the same time.