Season 3 Practice page
On the page it reads おとうさん　に　１万円　を　かします。 (i lent 10,000yen to my dad)
in the anki deck it reads おとうとさん　に　１万円　を　かします。　(i lent 10,000yen to my younger brother), but the answer to that is the previous, I lent 10,000yen to my dad.
Obviously a typo, but can be very confusing for beginners!