Need help from history knowing comrades, debunking the claim that Zionists have dibs on Palestine because it was a former colony and then the British gave it to them

So, I was having a long discussion with my liberal dad, and he said the statement above: Zionists have claim to Israel because apparently Palestine was a former British colony and it was given to the Jews by the British. Also, that there was not such thing as the country of Palestine before that. He also mentioned that apparently, Palestinians have refused the 2-state solution and that apparently makes them the bad guys for October 7th.

It is all pure liberal bs, but I don't know enough of the history of the occupation to debunk his claims thoroughly. Therefore, help debunking this would be appreciated.