My DP's last remaining parent very sadly passed away just over a year ago. It has been a bit of a rollercoaster of a year.
In a recent development though, my DP's eldest brother has started referring to himself as 'the head of the family'. For context, he will use it saying "I have x responsibility now because I am head of the family". "I am going to take x decision because I am head of the family". He withholds information from us on purpose, because it is only relevant he knows it as 'head of the family' etc.
He is not the head of my family - hahah! I feel like it's about 1820! Can I tell him where to stick it, or AIBU? 
I object to the principle of there being some sort of assumed hierarchy! 