To the OP...not sure of the exact details but you might want to look for any threads here relating to Portugal.
Other than that it looks like the outrage bus has been boarded by some, so to them:
If an individual is commuting in/out of the UK for work but resides with family "elsewhere" and they are using facilities "elsewhere" (healthcare, schooling etc) then I certainly don't see why the UK should be claiming the lion's share of tax on income ...just a IMHO of course.
To further reduce the angst dare I point out that many in the situation described by the OP still pay the full eye watering amount of UK NI (no reduction to that) and also a proportion of Income Tax based on time spent working in the UK.
What happens "taxwise" when you get home to family "elsewhere" is down to things such as Double Taxation agreements and local arrangements.