Spina Bifida Support Group
Spina bifida describes birth defects caused by an incomplete closure of one or more vertebral arches of the spine, resulting in malformations of the spinal cord. The spinal membranes and spinal cord may protrude through the absence of vertebral arches (called clefts).
Generally your odds of having a child with SB is only slightly increased by a spouse with SB. The chance goes from like 2% to 4 %. That is still a pretty low risk. Taking folic acid daily well before you conceive will help reduce the risk.
No one can predict what will happen with a person with SB. Some do well for a long, long time with no problems. Others have some walking or bladder deterioration (Doesn't function right). But there are new treatments coming along every time, and it sounds like he is already not walking and has had work done on his bladder.
Many people with Sb get married, have kids, and live long happy lives. You just cannot predict what health issues a person will have, though.