Is glaucoma genetic?

Multifactorial. Some glaucoma types have been mapped to specific genes through genetic linkage analysis and genome wide association studies, but this is a small percentage of glaucoma cases. Glaucoma is likely an interplay of genetic susceptibility as well as aging and other factors especially since there are many types.
Yes. Although not all types of glaucoma are genetic, such as traumatic and medication induced, a very common type does have a higher incidence within families. Regular eye care with your ophthalmologist can help detect this eye disease while in its early stages.