Ryan, the father of Johannes Bussema is not known. Bussema is her maiden name. His mother came to Amsterdam and lived there in 1839. Genlias gives his name as NN NN. This is short for the latin Nomen Nescio or in english Name Not Known. She might have been in the business that Amsterdam is still known for or she might have had an accident. The birth record that I copied tells us that she declared that she lived in a house standing at Weesperzijde near the Jansbridge 79/50.
The first kept census of Amsterdam is the 1851 census. She is then certainly already long away of Amsterdam.