Multiple Visa Holder visit to bahrain from Causeway

Dear All,

Please guide me regarding following,

My family living with me herein Jubail Saudi Arabia holding 2 year multiple visa.
On their passport written (مفتوح/Open) status.
Can I go Bahrain with my family by causeway for the purpose of exit & enter after completion of 180day. (If not please guide me regarding Bahrain E-visa procedure)
Dose I need my single entry visa also for this purpose (I am Iqama holder in KSA)
Can I bring my personal car for this visit.

Awaiting for your respond. :/ :/
Thanks & Regards,

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