A couple separate because of wife's infidelity. Father has

The child stays overnight every second weekend on Friday and Saturday and is due to stay with her and her new partner and their child, born Feb 2015, from Friday 10th July - Friday 17th July, 24th July - 31st July and 7th August- 14th August as holiday weeks from summer school holidays. Her reasons for not disclosing her address seem vague - she does not want her ex, my son, from seeing where she stays, although the past 2 addresses she stayed at were known to my son who just dropped the child off when her access was due.

The following is a copy of a sentence from a letter sent by her lawyer to my son's lawyer "Our client advises us that your client has made a pattern of either contacting her family in an inappropriate manner or making investigations about our client's life with her new partner." This allegation is completely untrue. He speaks to the ex partner of his wife's boyfriend, and they compare notes, so to speak. This is because she is the mother of the boyfriend's son, who often shares contact time. The boyfriend also has an 8 year old daughter to a different woman, who is also exercising contact with her dad. Recently my son complained of over-crowding at their house, and then was told by Ethan, his 6 year old son, that the boyfriend had had a shower with both him and his own son. Both children stated that the boyfriend had been naked. My son raised his concerns with Social Services. My son's ex wife has apologised to her boyfriend's ex partner for this happening but has never apologised to my son and is now, denying that it ever happened. He had also raised concerns with them last year, when Ethan started showing signs of "sexualised behaviour". At a CWH on June 5 he managed to convince the court to stop his wife taking their son back to his (and her) birth country of the Philippines for a holiday. He fears he will not be returned to the UK. There has been an Interim Interdict against her removing him from the country ever since proceedings started in 2013. She has been pushing hard to get this dropped. She has also raised an action which my son opposes, to get a capital sum of £50k from him. My son feels, as do I, that these actions now, in not disclosing her address, point to either pure spite and malice on her part, or that she has something to hide. The last time my son contacted any of his in-law family was December 2013 or Jan 2014. with no reply, I might add. And neither I nor he can see how chatting to the boyfriend's ex partner and comparing notes can be represented as "investigating" the boyfriend's relationship with my son's wife. Her lawyer has stated that if my son tries to find out where his client is staying it will confirm her "suspicions" while he states in the beginning of said letter that his client knows my son is making enquiries about them and their lifestyle!!! Doesn't make any sense to me.

We live in Scotland.