1. I think they met playing tennis but I'm not entirely sure.
2. Don't know
3. I think 13 years is acceptable. I personally wouldn't marry anyone old enough to be my parent/young enough to be my child (though I'm not going to have to worry about the second for quite some time!). It might have been more of an issue if Mathilde was under 20 but she was a mature, grown woman and they seem perfect for each other.
4. I've only just started to follow this family so pass.