My answer is the same as Matthew. I am back home so I don’t know. I wish I could be of more help. I hope you get to see it as it is beautiful and the area around it is too. Enjoy your time’.

Ti conviene controllare sul sito dedicato, così puoi verificare meglio. Le messe cambiano in base ai giorni ed alle festività

We walked up there, but saw tourist vans depositing people up near the church. There may be a ramp for you to push wheelchair up the last number of steps. Not sure.

Good evening... it lasts about an hou ron Sundays, and about 40-45 minutes on week days.

L'ingresso è libero

Take the metro to Blanche. This will bring you out right by the famous Moulin Rouge. Form here you can catch a “road train” up to Sacre Coeur for a few Euros (about €7 per person one way) or you can get a return if your parents need to, but it is an easy walk back down It’s a lovely trip up with English commentary, and so easy to get to and from. We have difficulty walking too far and we have just returned ourselves from Paris and discovered this by accident.

Uber is the easiest way but I don’t know about the car regulations. Good luck!

Oh and if you like art, make sure you walk behind the sacre couer and to the left, huge art market back there with people selling their handmade art, and lots of restaurants. Great art district and fun just to look. Amazing how talented some of these people are and it's a great homemade souvenir for a decent price.

The pick pockets are everywhere there is a crow, near the trains and metro as the scammers also have a strong presence in the crowds. Read all the scams before you go so you’ll be well aware of them. Get a backpack with locks and when in a crowd where it in front of you. Use a cross body purse and keep your hands on it as much as possible. We went in April which is the off season and it’s still very crowded and the scammers are everywhere. Be aware of your surroundings at all times and you should be ok.

Sorry I just picked up your message, but someone has answered your question. But anyway, always look at their website for basic information like this. As not everyone would have known your answer and nor did I.