As Per section 195 All payments made to non resident is subject to TDS only if it is required to be deducted on sums chargeable to tax in India under the Income-tax Act [Circular No. 786 dated 7th February, 2000..] except those are cover under chapter XII & XIIA because these payment are TDS under section 196B,196C & 196D......
Further all payment other than those cover by chapter XII & XIIA are TDS at actual rate of tax (i.e rate prescribed in relevant finance act+ SC+EC OR DTAA) & not ad-hoc rate which is normally used in TDS to resident
any payment other than salary which attract TDS u/s 192 and other than those payment which covered by section 194B/ 194BB/ 194E if made to Non resident then it would also taxed under same section and not under section 195 because under all above section TDS ate deducted at actual rate and not ad-hoc rate.
Non-residents making payments to non-residents are liable to TDS if the payments are chargeable to tax in India (228 ITR 487-AAR).
Click below to Read WIRC ref manual
https://wirc-icai.org/wirc_referencer/income%20tax%20&%20wealth%20tax/Tds%20on%20Payment%20to%20Non-resident%20us-195.htm
CONCLUSION:
In given case nonresident (cousin) making payment to nonresident (foreign co) therefore it is liable to TDS since the payments are chargeable to tax in India. (Income accrued in India)