Sugg regarding ltcg arised due to compulsory acqu by govt

Each of my parents got (RS--6 &- 8 lakhs) as  compensation on account compulsory acq of land (LTGS), i like to claim U/S 54 F ,my doubt is:

- whether both can invest their sum jointly in single house property(not Land).----(incase of purchase).

- whether they can puchase small site from half of this amount and remaining amount for construction on purchased site.(Eg : 5 lac for site and 9 lac for constuction on same site which purchased)

                                                                                                                                  Thankig in advance 

                                                                                                                                       krishna