Mah nishtanah halaylah hazeh mikol halaylot
1) She-bechol halaylot ain anu matbilin afilu pa’am echat, halaylah hazeh shtei pe’amim?
2) She-bechol halaylot anu ochlim chametz o matzah, halaylah hazeh kulo matzah?
3) She-bechol halaylot anu ochlim she’ar yerakot, halaylah hazeh maror?
4) She-bechol halaylot anu ochlim bain yoshvin u-vain mesubin, halaylah hazeh kulanu mesubin?

With all the diversity of different Jews and how we practice, it's good to know some things remain universal. This is the tune I remember using for the Four Questions. Even though I'm not the actual youngest, I'm the youngest in my family who can read Hebrew.