Claiming travel for inspecting property

So the ATO has a great video about what you can and can’t claim for travel including holidaying and the works, and it is very informative, not something new that I don’t know.

I do have a left field question about travel and I assume the answer won’t be in my favour (ATO nearly always has the odds stacked against you), however it is worth asking anyway. My wife and I own a couple of investment properties, and when we visit them, assuming we meet all the eligible criteria for claiming travel we do.

Where it becomes grey, is that I own a property purely in my name, and as such I am the only one who can claim deductions for this property, does this also mean, as my family are not “owners” of the property, that their travel to inspect the property is not tax deductible? At the moment my son flies free and he soon will also be a cost. Is it possible to claim all or any dependants costs for the travel to inspect properties, or are only the owners who can claim deductions allowed to claim their travel?

The long term solution is to add my wife to the property, but for now, can I only claim my own filght, or can I claim hers and/or soon to be our children’s flight costs?? Can you claim children’s flights ever for this purpose?