Instead of going for 30 years RD, you may go for 5 years RD, get the maturity value and invest in FD, continue RD for another 5 years and repeat the same till 30 years period. This will avoid many problems like identification, etc.
Further PPF may be opened for 15 years and extend for another 5 years. I am not sure whether second and third extensions are possible. Even otherwise, u may go for FD after 15 / 20 years.
Another way is, open one PPF account in your name for 15 years. After 5 years open one more PPF account in your son / daughter's name. Like that you phase out after every 5 years, so that after 15th year, 20, 25 and 30th year, they will mature. If 15 is extended to 20 years, then 3 accounts will be sufficient for 30 years.