Application for Custody – Governing principle: the welfare of the child is the first and paramount consideration – Impact of allegations of sexual molestation, substance abuse and physical violence on the determination of the best interests of the child – Application for Maintenance – Validity of post-nuptial Agreements – Whether proceeds from Trust in respect of which defendant is not the settlor, but is one of a number of beneficiaries, should be included in defendant’s means for the purpose of determining his capacity to pay maintenance