This answer is based on the assumption that the amount of 30 L you are transferring is paid by you out of savings / tax paid money.
Q1 and Q2 are both similar with change in recipients. Answer will be same in both scenario as both Wife and Father in Law are covered in the definition of relative in Section 56 of Income Tax Act. The word "Recipient" may be interpreted as your father in law for Q1 and Wife for Q2.
(a) The amount of 30 L Transferred will not be considered as Income of the Recipient.
(b) After the Gift, money will become the property of the recipient. Hence, any Interest earned on the same will be treated as Income of the Recipient only