"How likely is it that ones assets will be seized by the...

"How likely is it that ones assets will be seized by the government?"

I know multiple people that have had their house seized, despite their name being the only name on the deed. There are no property rights in Australia. We're essentially Saudi Arabia lite.

"In family law matters it would be the court ruling what it believes is a fair resolution."

Wow, people still believe this in 2018. Bitcoin gives you way better options than appealing to an authority for dispute resolution. For example, you could use 2 out of 2 multisig on a shared holding. Until both parties come to an agreement of how the money should be spent, it doesn't move.

"if you aren't trying hide money or earnings , a normal bank account works fine"

Bitcoin doesn't hide money very well at the moment, so this isn't a good example of why people would currently use it. Most people still transact on the base layer, which is completely public. Once 2nd layer solutions mature and see significant use, this will change. The main advantage to using Bitcoin currently is confiscation resistance.