Seriously, it is probably cheaper and better to buy a new Flying Pigeon, pour some salt water on it to let it rust for a weak to get years of patina in short time, and then give to them.

These ar regional brands Chinese bikes. The major brands are Forever, Feng Huang (Pheonix), and Flying Pigeon. They are all copies of the Raleigh roadsters, with small modifications.

Parts for these bikes are very inexpensive in China.