A Labour MP's parents transferred ownership of farm land to one of their sons days before changes to inheritance tax rules were announced.
Questions have been asked about whether Mid and South Pembrokeshire MP Henry Tufnell gave information to his parents about the proposed changes.
On 10 October his father and mother, Mark and Jane Tufnell, passed Upper Colne Farm and Stud to another son, Albermarle.
Tufnell declined to comment to Newyddion S4C but a spokesman told the Local Democracy Reporting Service it was "implausible" the MP could have known about the changes before they were made public.