She was the identical twin sister of Princess Sophie of Bavaria , mother of Emperor Franz Joseph I of Austria and Emperor Maximilian I of Mexico .
Head entity: emperor franz joseph i of austria Q51056 14 15 16 17 18 19
Tail entity: princess sophie of bavaria Q57653 7 8 9 10
Relation (head \u2192 tail): P25
Inverse relation (tail \u2192 head): P40