Umar and his son used to urinate standing

It was narrated that 'Umar said:
"The Messenger of Allah saw me urinating while standing, and he said: 'O 'Umar, do not urinate standing up.'"
- Sunan ibn Majah - The Book of Glorification and its Sunnah - Book 1, Hadith 328

Yahya related to mefrom Malikthat Abdullah ibn Dinar said, "I saw Abdullah ibn Umar urinating while standing."
- Muwatta Malik - Purity - Book 2, Hadith 143

And strangely the Wahhabis reject this Sunnah,

(Fatwa: 66/56/L=1434)
It is makrooh to urinate in the state of standing.
- Darul-Ifta Deoband