High school sweethearts 3 children no money for a weddi

Hello my name is Justin, my fiancé Jessica and I have been together for almost 15 years engaged for 13 years and we have 3 children together, our daughter is 13 our son 10 and youngest son is almost 3. i met jessica in comupter class when i was in 12th grade she was in 11th and we have been unseprable for going on 15yrs and we talk about having a wedding all the time but we just cant come up with the money for even a cheap wedding because we are always putting our children first which in our eyes is the right thing to do. I love jessica so so much and i wanna call her my wife and most of all i want our children to see us married because they ask all the time. I also would like to be married before our daughter is out of school and married. I am doing this without jessica knowing and would love to be able to tell her we are going to have a wedding and i know for sure she would just fall to the floor because her father is not doing so well and has had cancer for a few years now and if jessica had one wish it would be to have her father walk her down the isle before she has to walk alone. I love this girl more and more every day and it would mean the world to us to put this last puzzle piece in place and tie the knot that we have been trying to tie for years. Thank you so much for your help it is very much apreciated.