1) Is it alright that my dad has Vodafone broadband for himself and I have Telecom Broadband in my room. (I think I have to required switches/filters etc) or isn't I possible to have two broadband plans in one house.
2) Will I have to pay for home calling with Telecom? Or can I just use the broadband connection with Telecom (and pay an extra $10 per month) with the big time plan
You will need the 2nd broadband on another physical line. Thus, you will need to connect a new line with Telecom, and incur the landline and broadband costs.