I think lawyer not required.
Well, my brother is staying in India and I am/was in USA. So, while applying for him, I thought lawyer can prepare better docuementation. And based on proper documentation you will not miss anything and you are reducing the chances of rejection.
One more reason to hire lawyer was that. In India it takes 36 months for whole process. But we can apply from other country also. Lawyer told me, we can apply from Brazil or some other country, where things are faster. So, I was not aware of that, how to apply from foreign countries. so, I hired lawyer. And at last lawyer applied from Singapore, which is not really faster, may be bit faster than India.
Now, I heard that Manitoba PNP is faster. 9 months or so. Peole advertise such thing in India conferrence about Canada immigration.
When I applied, I did it by myself. But for my brother I hired lawyer. Infact, that firm lady is not lwayer. Any Tom, Dick and Harry can apply for you. It is not necessary to have lawyer degree to apply behalf of some one. Only thing person(Tom, dick) should be knowledgable. Lawyer charges from $1000 to $2000 US dollar.
By the way, on this portal, people can guide you and give answers, if you want to do it by your own.
Few more website can help you.
www.immihelp.com, www.cic.gc.ca, www.britishexpats.com
Well, my brother applid 1 year back. No interview or medical papers received. It takes time. From India 3 years, USA 2 years. Manitoba PNP, no idea, it is faster.
Good Luck for your relative.