Proceeds from Mutual Funds used for buying house will it be Liable to Long term capital gains

Are the proceeds from mutual funds subject to Long term capital gains if its used in purchasing a house ?Ex. A sold a house. 

Also can such a house be jointly purchased with family members & with second or thrid ownership of the new house ? ( Ex. A, B & C are family members & new house is jointly bought by A, B,C and ownership of new house  is as follows B followed by A & C )

Is this taxable ?