1) since your mother was co owner on mother demise her 50 per cent share would devolve on your father , you and your brother
2) you cannot evict your brother from the house as he has share in property .
3) it is better that during your father lifetime partition of property is made to avoid legal complications in future
4) in the alternative your father should file declaratory suit that he is absolute owner of the property as it was bought from his own savings . that your mother was house wife and had no source of income .
5) however suit would take some years to be disposed of .