We are very open about almsot everything in our family. We have helped both children at various times and aim to keep things fairly even, bu respond to the occasion as it arise.
Broadly, it seems to be DS usually gets a larger sum to meet needs for a new car etc but less frequently than DD who lives nearby and who, as she is single and childless, generally comes on holiday with us and helps when needed. When we have weekends away she comes and does the driving and we pay for all the commodation.
friendlygingercat, what a terrible thing for your parents to do. Our DD first expressed doubts about wanting children when she was 4. By the time she was 20 she was clear that she wanted to stay single and not have children and we have never tried to persuade her to change. She is now in her mid-50s and has never expressed any regrets about her decision.
On the other hand she adores her niece and nephew and has told us that if we gave money to them she would be entirely happy and not feel she needed to be compnsated for any 'loss' this might cause her.
We are talking to our Ds and DDiL about our contribtion when DGD goes to university next year, and depending where she goes, may offer to pay her rent. We should be able to pay it from income so it should not have any Inheritance tax problems.