1. You and your wife can execute a WILL for all the movable and immovable properties in favour of your son. The WILL takes effect after the death of you and your wife. You can clearly mention in the WILL that your son will be entitled to the property only after the demise of you and your wife.
2. If you are confident and believe that your son would take care of his parents, then you can gift the properties to your son during your lifetime itself by executing a Gift Deed in your son's favour. The gift deed takes effect immediately and your son will become the owner of the properties immediately during your lifetime itself.