I dont get very good wifi connection because the router itself is in my dads room which is at the back of the house, So I got a new router for myself to set up in my room. Can I set this up and use the same broadband connection or do I have to check this with my ISP?

Now when I set router up in my room everythings connected but cant get internet usually on the modem green light flashes when internet is available but it doesnt show. So for this to work I have to turn off my dads wifi router in order for mine to work. Dont want to have to do this everytime.

can someone help please