Is marrying a relative allowed by the Church?
The short answer
Never in the direct line, such as father and daughter or grandmother and grandson. In the collateral line, relatives as close as first cousins are impeded from marrying, but the bishop may dispense the impediment for first cousins.
The direct line
Consanguinity in the direct line — father and daughter, grandmother and grandson — always prohibits marriage.
The collateral line
In the indirect line, those as closely related as first cousins are impeded from marrying (CIC 1091). The bishop may dispense this impediment for first cousins.
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