Final answer:
The landlord is guilty of discrimination and possibly a violation of tenant rights for attempting to evict tenants because they are expecting a child.
Step-by-step explanation:
The landlord in the scenario provided is guilty of discrimination. This is because he is attempting to evict tenants based on the fact that they are expecting a child, which falls under the category of family status, a protected class under many anti-discrimination laws. Under the Pregnancy Discrimination Act of 1978, which amends the Civil Rights Act, such actions are prohibited. Furthermore, the eviction could also be seen as a violation of tenant rights, as tenants are usually entitled to a fair process and cannot be evicted without just cause, once a lease is in effect.