Protection Against Anticipated Abduction: My 'ex' lives in South Africa. He has remarried. I strongly suspect that he is planning to keep our son over there and not return him to Israel when he visits this coming holiday. A mutual friend over there told me that he had seen a family law lawyer over there and had been asking about his custody prospects. Can I do anything to prevent this?

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Yes, apply for an order preventing your son's exit from Israel, and ask the court to condition his exit upon his father providing substantial financial guarantees. You will need clear evidence of a danger of your son not coming back to get the order to remain in force.