Ieuan Sleeman, 25, and Dominic Sleeman, 60, were both found in possession of cannabis at a property on the town’s Windsor Road in November 2020.
Ieuan Sleeman faces the more serious charge of being in possession of cocaine at the property on the same date.
At Cardiff Crown Court on March 17, Dominic Sleeman pleaded guilty to one count of being in possession of cannabis with intent to supply
In the same case, Ieuan Sleeman pleaded guilty to one count of being in possession of cannabis with intent to supply and one count of being in possession of cocaine.
Both defendants will be subject to a pre-sentence report before being sentence at Cardiff Crown on April 14.
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