Hi Op
I think some of ubove posters reply have been somewhat harsh,
I can see both sides here, of yours and your parents situation here,
Your parents situation
Your mother unfortunately has MS , your father drinks 🍸 probably cause of the stress of caring for your mother, or he could have been a hard drinker before, your mom becoming ill with MS,?
Obviously not sure how long your mother had debilitating health disorder,?
You on the other hand feel like as their grand parents now,
It's a second chance to make up for their past failings as inadequate parens to yourself, who were either absent or not present emotionally as parents first time around,
I can see how you feel hard done by as they were not good enough parents /inadequate parents first time around,
And the present situation currently, makes you feel quite envious of other people/friends who have allways had more involved present parents/grandparents in their lives, than you unfortunately have,
your parents do not have to be there for you if they do not want to there for you, for whatever reasons,
however unfair this may feel towards yourself,
However I can see how your upbringing experiences and the reality of the way your current situation is,/family dynamics is, compounds this,
Makes your feel resentful,
I do get it, as you feel that your parents should have evolved matured enough to recognise their past feelings and want to make up for them now in that regard,
I think what you need to do, look into effective good therapy explore that, unresolved feelings of being abandoned emotional as a child,
Your feelings are very much valid,
Recognise however painful that your parents are human have flaws like anybody else, not perfect,
I think you need to accept your parents situation as it is and look how to adapt to this,
Such as lower expectations of them,
Such as not reliy on them for support in that way,
But could you just meet up with grandparnts or just your mother,?
in child/family friendly cafes/restaurants sometimes or on a regular basis every two weeks,
Could you arrange with them to vist the children's libarey together,with yourself?
When weather's gets better, why not meet up for family picnics in local parks /by the seaside or vist a leisure centre,
Having your children to learn to 🏊♂️ swim is obviously a good thing,
Could you take children go to the cinema to see Disney films with your parents or just one of your parents ?