gift deed during partition suit

Barring the suit property he is at liberty to gift his portion of land without affecting other's right.

Share of your father in-law is under dispute / litigation / undecided, hence it would be illegal to execute a gift deed qua his share.

You / he will have to wait for the outcome of lis.

Otherwise, what is the opinion and advise of the lawyer engaged by your father in-law who is well aware about facts and circumstances of the case, an able, competent and intelligent enough to satisfy your queries/ questions?

However, if you / your father in-law is not satisfied with his/ her (lawyer's) guidance it would be appropriate to seek service of another local prudent lawyer for appreciation of facts / documents, professional guidance and necessary proceedings

Facts posted are confused. Is it father or father-in-law? Did the property belong to your late mother? How it it that there are three shares? Please post simple facts.