Skandapurana 16.336.49

16.336.49

pitṛvaṃśe mṛtā ye ca mātṛvaṃśe tathaiva ca ..
guruśvaśurabaṃdhūnāṃ ye cānye bāṃdhavā mṛtāḥ .. 49 ..

Those who have died in the paternal lineage, and likewise in the maternal lineage, / and whatever other kinsmen of the guru, father-in-law, and relatives have died;