I don't know if this is "home improvement" since it is about an item in my garden but it is not about "gardening and landscaping" either so I am going to ask it here in the hope that, since it I think the skillset required to answer questions here probably overlaps so here goes...
I have bought a swing for my child and she loves it but the problem is that it does not swing straight. It is attached to a branch on a tree and as you can see in the photo below, the branch is not straight and, therefore, the ropes connecting either side of the swing are different lengths. Sadly I have no other tree to attach it to.
Try as I might I cannot get a good swing action on it (the seat turns during the swing even if I am very careful and apply an equal pressure push). I have got a spirit level out and the seat is horizontal (as far as the accuracy of that is able to ascertain) but it swings all wonky. I don't know, I have been tightening and re-tieing knots for months now and my wife is getting angry and the child starts to look at me with a concerned experssion every time I sit her on it to "give it one last go."
Is there a technique for fixing this thing? Should I build some sort of triangular wooden structure under it so the ropes are the same length?