Hi there!
MY daughter ( who is nearly three) has CP. She also had' tightness' in her legs ( rigidity or overtone).
If your child is three already and they are just starting to consider that he may have CP then he has a fairly mild case of it! They started suspecting CP when my daughter was 3 months and were pretty much certain when she was 6 months.
My daughter see's a physiotherapist , occupational therapist and speech language pathologist regularly , she also visits a CP clinic twice yearly ( consisting of a neurologist , physiotherapist, social workers , orthopeadic surgeon e.t.c.)
With CP (especially more severe cases) early intervention is key. Pus for your saon to be evaluated immediately and then start getting people involved n his care. Developmentally has he hit milestones on time? Any speech problems? Any fine motor skill problems? These are all things that can o with CP{ - if it is just the rigidity in his legs then your road sholdnt be too difficult - physio can probabaly help. My husband little sister als has CP , fairly mild case - sh had a couple of surgeries and they have helped her a lot - she is 11 no and you'd never know she had anything 'wrong' with her.
Anyway - if you have any questions I've been walking this road with my daughter forthe last three years and learned to navigate the world of hospitals , physiotherpay , e.t.c.- my best advice is to learn about your sons condition , understand it well enough to ask lots of questions and be assertive for his sake - you have to be his advocatein order to get the best care!
Take care
Boo