Thank you for this
Can you just confirm - how many weekends do you work and how many is Dad away for?
Alternate weekends is not an unreasonable request in itself - is there a reason why you feel that would be too much (and yes the father needs to be there!)
Whilst I believe that the letter from the grandparents is overbearing and unnecessary I also have to be honest with you - now that the relationship has been re-established there is little doubt that the court would move towards alternate weekends - or at least one in three IF the father will be there
I think your suggestion that it should start with just one night is reasonable - but it will need to build up to two - the six month review would work there
You also need to remove the reference to what your son would chose.
He is much too young to be asked - and if he was the court would not take his wishes into account.
Apart from that your letter is an excellent response to what was an unpleasant rant
I think you should say
"Tim is still young enough that the essentials are stability and security which is what I have always provided him with.
I have always promoted his contact with you, even when Simon was away, as I believe that he does need quality time with his paternal and wider family.
I think that my proposal offers this - and hope that we can avoid constant texts and phone calls about changes you wish to make."
I would incorporate the bit about Simon being able to collect from school - when you are talking about the Tuesday night contact put something like
" As you are very well aware I have ensured that the school are aware that Simon is indeed authorised to collect form school - as he has already done"