Brihat Parashara Hora Shastra
सुते सुतं विजानीयात् पत्नीं सप्तमभावतः । सुतभवे ग्रहो यः स्यात् सोऽपि कारक उच्यते ॥ ३३॥
It is also said, that a Grah in Putr becomes a Karak for wife.
english translation
sute sutaM vijAnIyAt patnIM saptamabhAvataH । sutabhave graho yaH syAt so'pi kAraka ucyate ॥ 33॥
hk transliteration by Sanscript