I think you really have a few questions here. You would need to know where the child lives in comparison to Sick Kids to determine if travel expenses even qualify as a medical expense. It's based on distance to the hospitial and if they could have received the same medical treatment at a place closer to them. If the medical expenses do qualify then they can be claimed by someone who can claim the child as a dependent. Depending on what the reason is for going to Sick Kids you may want to look at obtaining a Disability Tax Credit.
Medical can be very tricky and if you aren't sure how it will best work in your situation I would suggest you take the tax return to someone who has done work like this before.
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